Motor attachment for sewing machines



M. HEMLEB.

MOTOR ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED DEC, 21, 1911.

1 ,43 3 ,7 1 9. Patented Oct. 31, 1922.

INVENTOR Patented Oct. 31 1922.

UNITED STATES PATENT OFFICE,

MARTIN HEMLEB, OF ELIi-JABETH, NEW JAV ESEY. ASSIGNOR TO THF SINGERMANU- FACTURING COMPANY. A CORPORATION OF NEW JERSEY.

MOTOR ATTACHMENT FGR 5 LWING M1! SHINES.

Application filed December 21, 1917.

"1'1; all w/i/mi it/mag com 3M.

Be it known that l. .\l.\n'r| N Harman, a citizen of the United Statesresiding at .illizabeth, in the county of Union and State of New Jersey.have invented certain new and useful Improvements in Motor Attach mentsfor Sewing lilachincs, of which,the following is a specification.reference oein c had therein to the accompanying drawings.

This invention relates to motors for sewing machines and to attachmentsfor bolding them in driving relation with sewing machines.

In sewing machines provided with a driving motor and. adapted to bemoved either bodily or about a hinged connection with atable on whichthey are mounted, it has been found that the motor is liable to heaccidentally shifted out of a deisrable retracted or inoperativeposition with the result in drop-head sewing machines that it is liableto strike against the surface of the table and mar its appearance. Thepresent invention aims to insure retention of the motor in a desiredout-of-the-wav position to guard against accidental displacementtherefrom and more specifically in drophead sewing machines to preventnun-ring of the table on which the drop-head is hinged.

In'its preferred form the invention is aplied to a bracket fixedlysecured to the rame of the machine which bracket has hinged sections oneof which carries the motor and permits it being moved from a .positiondrivingthe machine to a position beneath the overhanging arm In whichlatter motor in drivingrelation with the machine.

Fig. 2 represents a sewing machine in crosssection with the motor in itsdrivingposi-c tion andlooking toward the vertical standard. Fig 3 showsin detail the specific con:

struction of a spring-latch for holding the motor on its bracket beneaththe overhangin arm. y

lhe drop-head of the sewing machine illustrated in the drawing comprisesa. base erial No. 208,205.

plate 1 from which rises a vertical standard 2 carrying an overhanginp,arm IE on the free cud of which is the head 1 in which are arranged oldand well known parts of the stitch-forming mechanism. A rotary shaft 5is sustained by the overhanging arm I and carries a belt-wheel 6 of oldand well known form.

Drop-head sewing machincs are usuallyniovahly supported on a table sothat they may be moved from a normal operating position. to an.inoperative position beneath the surface of the table. In the accompanying drawings the drop-head is shown hinged at T on one side of thebed-plate 1 to the table 8, the opposite side of the bed-plate beingsupported by a hinged section 9 of the table. The machine may be movedfrom its normal operative position shown in Fig. 2 to a position beneaththe table by swinging it upwardly about the hinge 7 turmnp the movablesection 9 upwardly out of the ways, and then swinging the drop-head downthrough the opening in the table. It is then'gene'ally concealed by aleaf or cover (not shown) hinged at one end of the table and movable soas to close the opening.

The motor 10 having a friction surfaced driving pulley 11 is supportedon a bracket having relatively movable sections 12 and 13 the former ofwhich is stationary and fixed to the vertical standard 2 of the drophead in a suitable manner as by the screw 14 and the latter of whichcarries a pin 15 loosely received within the aperture in the boss 16 ofthe stationary section 12. The motor is secured in any suitable mannerto the movable section 13 and about the pin 15 as an axis it maybe swungeither in driving relation with the machine as shown in dotted lines inFig. 1 or in non-driving position beneath the overhanging arm and out ofthe way. The stationary section 19 of the bracket has an apertured car17 hold in one end of a tension spring 18 whose otlier end is fixed tothe motor. By the a spring 18 the motor isheldin driving rela tion withthe machine when in the dotted line position shown in Fif. 1. When themotor \is moved to the so id line position shown in'Fig. 1 the spring 18crosses tii. axis of the pin 15 and conse uently ten h to hold the motorback under t e overhang ing arm. But the tension of the spring 1.

is not sufiicient to hold the motor against accidental displacement fromits retracted position and it can not be made heavy enough to hold themotor positively in the desired retracted position without imposing aprohibitively large load upon the motor when it is driving the machine.

In order to positively retain the motor in a retracted position out ofdriving relation with the machine a latch 19 is pivoted at 20 to themovable section 13 of the bracket and a slot 21 is formed in the boss 16of the stationary section 12 of the bracket, the parts being so disposedrelatively that the toe of the latch 19 seats within the slot or keeperunder the impetus of its spring 22 when the motor occupies the retractedposition shown in Fig. 1 beneath the overhanging arm. To swing the motorto the driving position shown in'dotted lines in Fig. 1 the operatormerely has to disengage the latch 19 from the recess or keeper 21.

It will thus be seen that in a very simple inexpensive and eflicientfashion I have provided means for positively retaining the driving motorof a sewing machine when shifted to an out-of-the-way position againstaccidental displacement and preventing the supporting table of drop-headmachines being marred. I

he usual method of arranging the parts in a drop-head sewing machine 1s,as illustrated in the drawings, to hinge the rear side of thecloth-plate 1 to the table 8 and to hinge a section 9 of the table soasdb sup port the front side of the cloth-plate. To drop the head ofthis type of machine, it is first swung rearwardly, then the hingedsection 9 of the table is swun upwardly and forwardly out of the way, ton the head is swung down beneath the table-top, and finally the section9 and cover-leaf section (not shown) are closed over the machine. Indrop-head cabinet construction standard form and arrangement like thatillustrated in the drawinghas been reached. It is neither desirable noradvisable to depart from the settled construction. It has maretablequalities and advantages demanded by the trade. It cannot be alteredwithout being rendered objectionable in one way or another. To suchsettled drop-head construction applicants invention is applied. It willbe seen that the initial step in the operation of lowering a drop-headmachine is to swing the head rearwardly to permit shifting the hingedsection 9 of the table out of the way. In this initial step, the tensionof spring 18 (which it will be remembered crosses to the front of theaxis of pin 15 when the motor is positioned under the arm) is not enoughto resist the force of gravity pulling the motor down about the pivot 15and'the motor is likely to strike against the top of the table and marits finish. Minusthe latch, the construction and arrangement of motor-suport is commercially unsatisfactory. With the latch this objection isovercome and the device rendered practical. The latch constitutesprimarily a means for holding the motor in operative position during themovement of the drop-head to concealed position, but it will be obviousthat when the motor is under the arm the latch also guards againstaccidental displacement thereof whether the head be upright or lowered.

Having thus set forth the nature of the invention, what I claim hereinis 1. In combination, a'table, a sewing machine having a drop-headincluding a bedplate and an overhanging arm, a hinge connecting saiddrop-head and table on one side of the bed-plate, means movable upwardlyrelative to the table for sustaining the op posite side of the bed-plateand supporting the bed-plate of the head substantially flush with thetable whereby the head ma be dropped beneath the plane of the tab e, arotary shaft supported by said arm, a motor, driving connections betweensaid motor and said shaft, a support for said motor attached to thedrop-head and having a pivoted section permittin the motor to be swunfrom an operative driving relation with t e rotary shaft to aninoperative position beneath the overhanging arm, means for holdin saidmotor in driving realtion with the shaft during the operation of thesewing machine, and positive mechanical means for holding said motorbeneath the arm when the drophead is moved on its hinged connection tothe table.

2. In combination, a table, a sewing machine having a drop-headincluding a bedplate and an overhanging arm, a hinge connecting saiddrop-head and table on one side of the bed-plate, means movable upwardlyrelative to the table for sustaining the opposite side of the bed-plateand sup rting the bed-plate of the head substantial y flush with thetable whereby the head may be dropped beneath the plane of the table, arotary shaft supported by said arm, a motor, driving connections betweensaid motor and sai dmotor in driving relation with the shaft to thedrop-head and having a pivoted section permitting the motor to be swungfrom an inoperative position beneath the overhan ing arm, means forholding said motor in riving relation with the shaft durin the operationof the sewing machine, an latching mechanism baa een the pivoted sectionand its support for ilding said motor beneath the arm when the drop-headis moved on its hinged connection to the table.

3. In combination, a table, a sewing machine arranged to be moved from anormal operative position to an inoperative position beneath the table,a motor, means on said motor and machine for driving the latter from11116: former, and supporting means on the machine for sustaining themotor permitting movement of the motor from a driving position to anon-driving position, and means for locking the motor againstdisplacement in anydirection from non-driving position.

4. In combination, a table, a sewing machine arranged to be moved from anormal operative position to an inoperative position beneath the table,a motor, means on said motor and machine for driving the latter from theformer, and supporting means on a the machine for sustaining the motorpermitting movement of the motor from a driving position to anon-driving position, and a spring latching mechanism on said supportingmeans for locking the motor in a nondriving position.

5. In combination, a sewing machine, a motor for driving the machine,and a bracket sustained by the machine and supporting the motor, saidbracket having relatively movable sections one of which is provided witha keeper el. cent, at latch mounted upon and movable relatively to theother of said sections and adapted to cooperate with the keeper elementto lock the motor in a desired position.

6. In combination, a sewing machine, a motor for driving the machine,and a bracket sustained by the machine and SUPPOIts ing the motor, saidbracket having sections hinged to swing relativel to one another aboutone axis only, one 0 said sections being provided with a keeper elementand the other carrying amovable latch adapted to cooperate with thekeeper element to lock the motor in a desired position.

7. In combination, a sewing machine including a work-su port and anoverhang; ing arm, a motor or driving theinachine, a support for themotor secured to the overhanging arm, means on the motor-supportallowing the motor to be moved either to operative driving position atone side of the arm or to inoperative position beneath the arm, andlocking means on the support for fixing the motor against displacementin any direction from inoperative position.

In testimony whereof, I have signed my name to this specification.

MARTIN HEMLEB.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,433,719, grantedOctober 31, 1922, upon the application of Mex-tin Hemleb, of Elizabeth,New Jersey, for in improvement in Motor Attachments for Sewing Machines,errors appear in the prihted specification requiring correction as follows: Page 1, line 78, for the word ways read way; page 2, line. 95,c-lnim l,vfmthe misspelled word realtion rend relation, and line 110,daim :3, strike out the words motor in driving relation with the shaftand insert almft, a mppm't for sm'd motor attached," page 3, line 26,claim 5, for the word at read a. and that the said Letters Patent shouldbe read with these corrections therein that the same may conform to therecord of the ease in the Patent Oflioe.

Signed and sealed this 5th day of December, A. D., 1922.

m Km FENNING,

Acting 'mnmz'esimr of Patents.

